had been releasing
-había estado liberando
Had been releasing is the past perfect progressive form of release in the first person singular. There are other translations for this conjugation.
See the full release conjugation

release

TRANSITIVE VERB
(to make public)-lanzar
Synonyms for release
TRANSITIVE VERB
(to emit)-desprender
Synonyms for release
Antonyms for release
NOUN
(publication)-la publicación
Synonyms for release
NOUN
(emission of gases)-la emisión
Synonyms for release
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